Communication relay apparatus and communication relay method
a relay and relay technology, applied in repeater circuits, frequency-division multiplexes, high-level techniques, etc., can solve the problems of significant attenuation due to transmission distance, short radio frequency resources, etc., to prevent the overall data throughput of the communication system from decreasing, improve error rate performance, and improve throughput
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embodiment 1
[0036]FIG. 1 shows an outline of the communication system according to Embodiment 1 of the present invention.
[0037]This communication system includes mobile station MS1, relay stations RS1 and RS2, and base station BS1, and mobile station MS1 is located outside the cellular service area managed by base station BS1. The user of mobile station MS1 desires to communicate with base station BS1. However, mobile station MS1 is located outside the cellular service area, and therefore is unable to perform communication in this situation. Therefore, in the communication system according to this embodiment, relay station RS1 or relay station RS2 located between mobile station MS1 and base station BS1 is made to relay communication between mobile station MS1 and base station BS1. In addition, for ease of explanation, a case will be described as an example where signals are transmitted from mobile station MS1 to base station BS1, that is, uplink communication (uplink relay).
[0038]In the communi...
embodiment 2
[0100]The communication relay apparatus according to Embodiment 2 of the present invention compares a subcarrier determined to have good received quality in relay determination with a hard decision threshold value. Then, the received symbol of a subcarrier having better received quality than the hard decision threshold value is subjected to a hard decision and re-modulation, and transferred.
[0101]The basic configuration of the communication relay apparatus according to this embodiment is the same as communication relay apparatus 100 described in Embodiment 1. Therefore, the same parts will not be described, and non-regenerative relay processing section 210 which is a different configuration from communication relay apparatus 100 will be described below.
[0102]FIG. 14 is a block diagram showing the main internal configuration of non-regenerative relay processing section 210. The components that are the same as non-regenerative relay processing section 110 (refer to FIG. 4) described i...
embodiment 3
[0124]In Embodiment 3 of the present invention, in a non-regenerative relay, the amplification factor of transmission power for subcarriers having poor received quality is set relatively higher than an amplification factor of transmission power for subcarriers having good received quality. By this means, it is possible to reduce the influence of interference against base station BS1, which is the receiving station.
[0125]The basic configuration of the communication relay apparatus according to this embodiment is the same as communication relay apparatus 100 described in Embodiment 1. Therefore, explanation of the same parts will be omitted, and the configuration of non-regenerative relay processing section 110 and its surroundings which is different from communication relay apparatus 100 will be described below.
[0126]FIG. 20 is a block diagram showing the configuration of non-regenerative relay processing section 110 and its surroundings.
[0127]Weight coefficient calculating section 3...
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